Answering Questions- around 100 words

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I’m studying for my Chemistry class and don’t understand how to answer this. Can you help me study?

watch the video https://www.youtube.com/watch?v=Tezbnr1QJNI&feature=youtu.be

answer the question .

Questions that arise: Why does the dollar dominate trade even though alternate currencies are available (Euro, GBP, Yen and now Yuan(Renminbi). More so in swaps – when it should not really matter – Euro or GBP or Yen can be far more significant? What may explain it?

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